21. Abbrevation form of CMPDIL
22. The immediate roof is called
23. Cavability of a roof bed in a long wall panel is affect by its
24. For testing a specimen in laboratory length's diameter ratio should be
25. The resistance which a body offers to being pulled asending by tensile force is called
26. The load on a prop when upper member is begins to sliders called
27. Fracture in blast hole is due to
28. Schmidi Hammer rebound test is carried out in rock for determining.
29. One of the first culliery power station was installed in the year
30. Gypsum deposit is
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